干燥方式对高氯酸铵,石墨烯复合材料的结构和热分解行为的影响
通过溶胶.凝胶法制备了石墨烯水凝胶,并将其与高氯酸铵(AP)复合,然后分别采用自然干燥、冷冻干燥和超临界CO2干燥三种干燥方式制备了AP/石墨烯复合材料,并通过扫描电镜(SEM)、元素分析(EA)、X射线衍射(XRD)、差示扫描量热仪(DSC)和热重-红外联用技术(TG-FTIR)研究了不同干燥方式对其结构和热分解行为的影响.结果表明,干燥方式对AP/石墨烯复合材料的形貌具有明显影响,其中通过超临界CO:干燥制备的AP/石墨烯复合材料基本能保持与石墨烯气凝胶相似的外观和多孔结构.通过自然干燥、冷冻干燥和超临界COz干燥制备的AP/石墨烯复合材料中AP的质量分数分别为89.97%、92.41%和...
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Published in | 物理化学学报 Vol. 29; no. 10; pp. 2079 - 2086 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
中国兵器科学研究院,北京100089
2013
北京理工大学材料学院,北京,100081%北京理工大学材料学院,北京100081 |
Subjects | |
Online Access | Get full text |
ISSN | 1000-6818 |
DOI | 10.3866/PKU.WHXB201305021 |
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Summary: | 通过溶胶.凝胶法制备了石墨烯水凝胶,并将其与高氯酸铵(AP)复合,然后分别采用自然干燥、冷冻干燥和超临界CO2干燥三种干燥方式制备了AP/石墨烯复合材料,并通过扫描电镜(SEM)、元素分析(EA)、X射线衍射(XRD)、差示扫描量热仪(DSC)和热重-红外联用技术(TG-FTIR)研究了不同干燥方式对其结构和热分解行为的影响.结果表明,干燥方式对AP/石墨烯复合材料的形貌具有明显影响,其中通过超临界CO:干燥制备的AP/石墨烯复合材料基本能保持与石墨烯气凝胶相似的外观和多孔结构.通过自然干燥、冷冻干燥和超临界COz干燥制备的AP/石墨烯复合材料中AP的质量分数分别为89.97%、92.41%和94.40%,其中通过超临界COz干燥制备的复合材料中AP的粒径尺寸为69nm.DSC测试结果表明,石墨烯对AP的热分解过程具有明显的促进作用,能使AP的低温分解过程大大减弱,高温分解峰温明显降低.三种干燥方式相比,通过超临界CO2干燥制备的AP/石墨烯复合材料中石墨烯的促进作用最明显.与纯AP相比,其高温分解峰温降低了83.7℃,表观分解热提高到2110J.g-1.TG-FTIR分析结果表明,AP/石墨烯复合材料的热分解过程中,AP分解产生的氧化性产物与石墨烯发生了氧化反应,生成了CO2. |
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Bibliography: | 11-1892/06 WANG Xue-Bao,LI Jin-Qing,LUO Yun-Jun (1Sehool of Material Science & Engineering, Beijing Institute of Technology, Beijing 100081, 17. R. China; 2Academy of Ordnance Science, Beijing 100089, P. R. China) Drying method; Graphene; Ammonium perchlorate; Sol-gel method; Thermaldecomposition Graphene hydrogels were prepared by the sol-gel method, and then used to prepare ammonium perchlorate (AP)/graphene composites by the incorporation of AP. The composites were dried naturally in air, freeze-dried, or dried with supercritical CO2. Scanning electron microscopy (SEM), elemental analyses (EA), and X-ray diffraction (XRD) were used to characterize the structure of the AP/ graphene composites dried using different methods. Furthermore, the thermal decomposition behavior of the AP/graphene composites was investigated by differential scanning calorimetry (DSC) and thermogravimetric analysis/infrared spectroscopy (TG-FTIR). Drying method had an obvious influence on the morphology of the AP/graphene composites; on |
ISSN: | 1000-6818 |
DOI: | 10.3866/PKU.WHXB201305021 |